/Engine/Plugins/EnhancedInput/Source/EnhancedInput/Public/UserSettings/EnhancedInputUserSettings.h
If the given Out Array is empty, then the Default Mapping will be applied to the player, but no player mapped keys will be.
virtual int32 GetPlayerMappedKeysForRebuildControlMappings ( const [FEnhancedActionKeyMapping](API\Plugins\EnhancedInput\FEnhancedActionKeyMapping) & DefaultMapping, [TArray](API\Runtime\Core\Containers\TArray)< [FKey](API\Runtime\InputCore\FKey) > & OutKeys ) const